/*
 * @(#)ASCII.java	1.14 05/11/17
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package ext.regex2;

/**
 * Utility class that implements the standard C ctype functionality.
 *
 * @author Hong Zhang
 */

final class ASCII {

	static final int UPPER = 0x00000100;

	static final int LOWER = 0x00000200;

	static final int DIGIT = 0x00000400;

	static final int SPACE = 0x00000800;

	static final int PUNCT = 0x00001000;

	static final int CNTRL = 0x00002000;

	static final int BLANK = 0x00004000;

	static final int HEX = 0x00008000;

	static final int UNDER = 0x00010000;

	static final int ASCII = 0x0000FF00;

	static final int ALPHA = (UPPER | LOWER);

	static final int ALNUM = (UPPER | LOWER | DIGIT);

	static final int GRAPH = (PUNCT | UPPER | LOWER | DIGIT);

	static final int WORD = (UPPER | LOWER | UNDER | DIGIT);

	static final int XDIGIT = (HEX);

	private static final int[] ctype = new int[] {
		CNTRL,				  /* 00 (NUL) */
		CNTRL,				  /* 01 (SOH) */
		CNTRL,				  /* 02 (STX) */
		CNTRL,				  /* 03 (ETX) */
		CNTRL,				  /* 04 (EOT) */
		CNTRL,				  /* 05 (ENQ) */
		CNTRL,				  /* 06 (ACK) */
		CNTRL,				  /* 07 (BEL) */
		CNTRL,				  /* 08 (BS)  */
		SPACE + CNTRL + BLANK,  /* 09 (HT)  */
		SPACE + CNTRL,		  /* 0A (LF)  */
		SPACE + CNTRL,		  /* 0B (VT)  */
		SPACE + CNTRL,		  /* 0C (FF)  */
		SPACE + CNTRL,		  /* 0D (CR)  */
		CNTRL,				  /* 0E (SI)  */
		CNTRL,				  /* 0F (SO)  */
		CNTRL,				  /* 10 (DLE) */
		CNTRL,				  /* 11 (DC1) */
		CNTRL,				  /* 12 (DC2) */
		CNTRL,				  /* 13 (DC3) */
		CNTRL,				  /* 14 (DC4) */
		CNTRL,				  /* 15 (NAK) */
		CNTRL,				  /* 16 (SYN) */
		CNTRL,				  /* 17 (ETB) */
		CNTRL,				  /* 18 (CAN) */
		CNTRL,				  /* 19 (EM)  */
		CNTRL,				  /* 1A (SUB) */
		CNTRL,				  /* 1B (ESC) */
		CNTRL,				  /* 1C (FS)  */
		CNTRL,				  /* 1D (GS)  */
		CNTRL,				  /* 1E (RS)  */
		CNTRL,				  /* 1F (US)  */
		SPACE + BLANK,		  /* 20 SPACE */
		PUNCT,				  /* 21 !     */
		PUNCT,				  /* 22 "     */
		PUNCT,				  /* 23 #     */
		PUNCT,				  /* 24 $     */
		PUNCT,				  /* 25 %     */
		PUNCT,				  /* 26 &     */
		PUNCT,				  /* 27 '     */
		PUNCT,				  /* 28 (     */
		PUNCT,				  /* 29 )     */
		PUNCT,				  /* 2A *     */
		PUNCT,				  /* 2B +     */
		PUNCT,				  /* 2C ,     */
		PUNCT,				  /* 2D -     */
		PUNCT,				  /* 2E .     */
		PUNCT,				  /* 2F /     */
		DIGIT + HEX + 0,		/* 30 0     */
		DIGIT + HEX + 1,		/* 31 1     */
		DIGIT + HEX + 2,		/* 32 2     */
		DIGIT + HEX + 3,		/* 33 3     */
		DIGIT + HEX + 4,		/* 34 4     */
		DIGIT + HEX + 5,		/* 35 5     */
		DIGIT + HEX + 6,		/* 36 6     */
		DIGIT + HEX + 7,		/* 37 7     */
		DIGIT + HEX + 8,		/* 38 8     */
		DIGIT + HEX + 9,		/* 39 9     */
		PUNCT,				  /* 3A :     */
		PUNCT,				  /* 3B ;     */
		PUNCT,				  /* 3C <     */
		PUNCT,				  /* 3D =     */
		PUNCT,				  /* 3E >     */
		PUNCT,				  /* 3F ?     */
		PUNCT,				  /* 40 @     */
		UPPER + HEX + 10,	   /* 41 A     */
		UPPER + HEX + 11,	   /* 42 B     */
		UPPER + HEX + 12,	   /* 43 C     */
		UPPER + HEX + 13,	   /* 44 D     */
		UPPER + HEX + 14,	   /* 45 E     */
		UPPER + HEX + 15,	   /* 46 F     */
		UPPER + 16,			 /* 47 G     */
		UPPER + 17,			 /* 48 H     */
		UPPER + 18,			 /* 49 I     */
		UPPER + 19,			 /* 4A J     */
		UPPER + 20,			 /* 4B K     */
		UPPER + 21,			 /* 4C L     */
		UPPER + 22,			 /* 4D M     */
		UPPER + 23,			 /* 4E N     */
		UPPER + 24,			 /* 4F O     */
		UPPER + 25,			 /* 50 P     */
		UPPER + 26,			 /* 51 Q     */
		UPPER + 27,			 /* 52 R     */
		UPPER + 28,			 /* 53 S     */
		UPPER + 29,			 /* 54 T     */
		UPPER + 30,			 /* 55 U     */
		UPPER + 31,			 /* 56 V     */
		UPPER + 32,			 /* 57 W     */
		UPPER + 33,			 /* 58 X     */
		UPPER + 34,			 /* 59 Y     */
		UPPER + 35,			 /* 5A Z     */
		PUNCT,				  /* 5B [     */
		PUNCT,				  /* 5C \     */
		PUNCT,				  /* 5D ]     */
		PUNCT,				  /* 5E ^     */
		PUNCT | UNDER,		  /* 5F _     */
		PUNCT,				  /* 60 `     */
		LOWER + HEX + 10,	   /* 61 a     */
		LOWER + HEX + 11,	   /* 62 b     */
		LOWER + HEX + 12,	   /* 63 c     */
		LOWER + HEX + 13,	   /* 64 d     */
		LOWER + HEX + 14,	   /* 65 e     */
		LOWER + HEX + 15,	   /* 66 f     */
		LOWER + 16,			 /* 67 g     */
		LOWER + 17,			 /* 68 h     */
		LOWER + 18,			 /* 69 i     */
		LOWER + 19,			 /* 6A j     */
		LOWER + 20,			 /* 6B k     */
		LOWER + 21,			 /* 6C l     */
		LOWER + 22,			 /* 6D m     */
		LOWER + 23,			 /* 6E n     */
		LOWER + 24,			 /* 6F o     */
		LOWER + 25,			 /* 70 p     */
		LOWER + 26,			 /* 71 q     */
		LOWER + 27,			 /* 72 r     */
		LOWER + 28,			 /* 73 s     */
		LOWER + 29,			 /* 74 t     */
		LOWER + 30,			 /* 75 u     */
		LOWER + 31,			 /* 76 v     */
		LOWER + 32,			 /* 77 w     */
		LOWER + 33,			 /* 78 x     */
		LOWER + 34,			 /* 79 y     */
		LOWER + 35,			 /* 7A z     */
		PUNCT,				  /* 7B {     */
		PUNCT,				  /* 7C |     */
		PUNCT,				  /* 7D }     */
		PUNCT,				  /* 7E ~     */
		CNTRL,				  /* 7F (DEL) */
	};

	static int getType(int ch) {

		return ((ch & 0xFFFFFF80) == 0 ? ctype[ch] : 0);
	}

	static boolean isType(int ch, int type) {

		return (getType(ch) & type) != 0;
	}

	static boolean isAscii(int ch) {

		return ((ch & 0xFFFFFF80) == 0);
	}

	static boolean isAlpha(int ch) {

		return isType(ch, ALPHA);
	}

	static boolean isDigit(int ch) {

		return ((ch - '0') | ('9' - ch)) >= 0;
	}

	static boolean isAlnum(int ch) {

		return isType(ch, ALNUM);
	}

	static boolean isGraph(int ch) {

		return isType(ch, GRAPH);
	}

	static boolean isPrint(int ch) {

		return ((ch - 0x20) | (0x7E - ch)) >= 0;
	}

	static boolean isPunct(int ch) {

		return isType(ch, PUNCT);
	}

	static boolean isSpace(int ch) {

		return isType(ch, SPACE);
	}

	static boolean isHexDigit(int ch) {

		return isType(ch, HEX);
	}

	static boolean isOctDigit(int ch) {

		return ((ch - '0') | ('7' - ch)) >= 0;
	}

	static boolean isCntrl(int ch) {

		return isType(ch, CNTRL);
	}

	static boolean isLower(int ch) {

		return ((ch - 'a') | ('z' - ch)) >= 0;
	}

	static boolean isUpper(int ch) {

		return ((ch - 'A') | ('Z' - ch)) >= 0;
	}

	static boolean isWord(int ch) {

		return isType(ch, WORD);
	}

	static int toDigit(int ch) {

		return (ctype[ch & 0x7F] & 0x3F);
	}

	static int toLower(int ch) {

		return isUpper(ch) ? (ch + 0x20) : ch;
	}

	static int toUpper(int ch) {

		return isLower(ch) ? (ch - 0x20) : ch;
	}
}
